HELP a 2 WEEK OLD baby kitten has been abandoned.. PLZ HLP?

Okay, my 1 year old cat has had a kitten. and we have a doggy/ cat door so it goes outside and inside whenever it feels like it. it stays with it's kitten most of the time and is only away from it when eating and going to the toilet. but today, it hasn't been hanging around the kitten much. and it has not been near the kitten for about 7 hours. this is the cats first successful litter and i think that the cat might be an immature mother for now. but any help of what i can do, the kitten is about TWO WEEKS OLD. i do not have anything for it to drink until morning which is in about ten hours, because i live in rural australia. but anything that i can do to keep the little thing going. it's crying and i have it in my blankets now, and it's pushing it's hands around looking for a nipple. PLEASE HELP, what can i do